An adult moroi crystalwing is long and lean capable of an apparently effortless loping stride on four legs, and an ability to sit on its hindquarters in order to scan the area around it. Their crystals are very rare and highly prized for use in dark and blood magics, but moroi themselves are generally indifferent to the other living creatures around them. Adult moroi rarely breed and magi aren't sure what triggers their breeding season, though it's possibly related to the phases of the moon. As adults, moroi still eat mostly raw meat, but appear to consider blood a special treat, though most at least have the manners to wait until it's offered instead of just taking it.

Moroi crystalwings are loners, avoiding the company of even their own kind except during their rare mating seasons, though they do seem to have an affinity for the chupacabra. Their distinctive colourings - red and gold for the male, silver and blue for the female - make them easy to recognize, assuming a magi can get close enough to tell the difference in the dark areas where they like to live. Some moroi crystalwings have been found in abandoned manors, where they hoard stashes of gold and jewels, but this seems to be an unusual behaviour. Their great wings enable them to fly long distances, but their flight is silent enough that more than one magi has been startled by unexpectedly encountering one in the isolated countryside.